Talk about the python built in variable reversed of seq

1. Simple interpretation: invert 1 sequence object

Example 1:

def fun3():
  x = [3,6,9]
  for i in reversed(x):
  print(i,end=',')
fun3()

Output:

""," nine,6,3,

Example 2:

>>> a = range(5)
>>> a
range(0, 5)
>>> list(a)
[0, 1, 2, 3, 4]
>>> a1 = reversed(a)
>>> list(a1)
[4, 3, 2, 1, 0]